DiRT 4 Hints?

This tweet from Codemasters designer Paul Coleman offers a photo of the Ford Focus used to promote previous installments in the DiRT franchise, along with a caption suggesting this is a tease for the rally racing series: "Commence your speculation. #dirt." A follow-up says: "Another teaser. Sadly I can't say what I am actually doing but it's fun." So? Get to speculating! Thanks VG247.